class Exercise6
{
  public static void main(String args[])
  {
    int x1=10,x2=10,x3=10,x4=10;
    int y1,y2,y3,y4;
    y1=x1++;
    y2=x2--;
    y3=++x3;
    y4=--x4;
    System.out.println("y1="+y1);
    System.out.println("y2="+y2);
    System.out.println("y3="+y3);
    System.out.println("y4="+y4);
  }
}